Tuesday’s independent disciplinary committee decided the red card was justified for foul play but “determined that, whilst reckless, the low-range entry point of two weeks was appropriate with the full 50% mitigation applied”.
Cummings benefited from “an exemplary disciplinary record, good conduct and having shown remorse”.
Scotland were already going to be without three other Glasgow forwards – Jack Dempsey, Max Williamson and Gregor Brown – through injury against Portugal.
Warriors hooker Johnny Matthews and Scarlets prop Alex Hepburn were called up as replacements.